Remark
You could use the carpenter's method of doing this or you could find it using the tangent or you could use the slope formula. All methods work.
Use the two easiest points to work with for the slope formula.
(x1,y1) = (0, 6)
(x2,y2) = (8,8)
Formula
m = (y2 - y1) / (x2 - x1)
Solution
m = (8 - 6) / (8 - 0) = 2/8
Answer
m = 1/4 in reduced form or
m = 0.25 in decimal form.
Look among your answers for the right choice.